Facebook messenger chat heads aren't popping up.

[AC Question]

Aren't popping up unless I'm on Facebook or I deliberately open the chat head. Also there is no notification showing I got a message on my s6 edge plus. Help I've checked all the notification setting and chat heads setting.

 

[MaverThePrime]

I've got this same problem on my S5, after the update, I don't receive any notifications, all settings are good. I also tried reinstall and this same... Help us!!